datamsg(9f) [minix man page]
datamsg(9F) Kernel Functions for Drivers datamsg(9F) NAME
datamsg - test whether a message is a data message SYNOPSIS
#include <sys/stream.h> #include <sys/ddi.h> int datamsg(unsigned char type); INTERFACE LEVEL
Architecture independent level 1 (DDI/DKI). PARAMETERS
type The type of message to be tested. The db_type field of the datab(9S) structure contains the message type. This field may be accessed through the message block using mp->b_datap->db_type. DESCRIPTION
datamsg() tests the type of message to determine if it is a data message type (M_DATA, M_DELAY, M_PROTO , or M_PCPROTO). RETURN VALUES
datamsg returns 1 if the message is a data message 0 otherwise. CONTEXT
datamsg() can be called from user or interrupt context. EXAMPLES
Example 1: The put(9E) routine enqueues all data messages for handling by the srv(9E) (service) routine. All non-data messages are han- dled in the put(9E) routine. 1 xxxput(q, mp) 2 queue_t *q; 3 mblk_t *mp; 4 { 5 if (datamsg(mp->b_datap->db_type)) { 6 putq(q, mp); 7 return; 8 } 9 switch (mp->b_datap->db_type) { 10 case M_FLUSH: ... 11 } 12 } SEE ALSO
put(9E), srv(9E), allocb(9F), datab(9S), msgb(9S) Writing Device Drivers STREAMS Programming Guide SunOS 5.10 11 Apr 1991 datamsg(9F)
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datamsg(9F) Kernel Functions for Drivers datamsg(9F) NAME
datamsg - test whether a message is a data message SYNOPSIS
#include <sys/stream.h> #include <sys/ddi.h> int datamsg(unsigned char type); INTERFACE LEVEL
Architecture independent level 1 (DDI/DKI). PARAMETERS
type The type of message to be tested. The db_type field of the datab(9S) structure contains the message type. This field may be accessed through the message block using mp->b_datap->db_type. DESCRIPTION
datamsg() tests the type of message to determine if it is a data message type (M_DATA, M_DELAY, M_PROTO , or M_PCPROTO). RETURN VALUES
datamsg returns 1 if the message is a data message 0 otherwise. CONTEXT
datamsg() can be called from user or interrupt context. EXAMPLES
Example 1: The put(9E) routine enqueues all data messages for handling by the srv(9E) (service) routine. All non-data messages are han- dled in the put(9E) routine. 1 xxxput(q, mp) 2 queue_t *q; 3 mblk_t *mp; 4 { 5 if (datamsg(mp->b_datap->db_type)) { 6 putq(q, mp); 7 return; 8 } 9 switch (mp->b_datap->db_type) { 10 case M_FLUSH: ... 11 } 12 } SEE ALSO
put(9E), srv(9E), allocb(9F), datab(9S), msgb(9S) Writing Device Drivers STREAMS Programming Guide SunOS 5.10 11 Apr 1991 datamsg(9F)